When someone says "a salary of 40 million won," that money doesn't land in your account as-is. What remains after several deductions is your take-home pay. If you're facing a job change or a salary negotiation, understanding this structure makes a real difference at the table. Let's look at what gets deducted and why.
Two blocks come out of gross pay
The deductions that reduce take-home pay fall into two groups: the four major insurances and taxes.
The four major insurances
Social insurance shared between employee and employer. The employee's share is roughly:
- National Pension: about 4.5% of the standard monthly income
- Health Insurance: a set rate of monthly pay
- Long-Term Care: a further rate applied to the health insurance premium
- Employment Insurance: a set rate of monthly pay
These rates are adjusted annually, and together they typically take around 9% of gross pay as the employee's share.
Taxes
- Income tax: withheld monthly based on the simplified withholding tax table.
- Local income tax: 10% of the income tax.
Tax is progressive: the rate rises with income, so as salary grows, the take-home share edges down.
Three variables that change take-home pay
For the same salary, net pay varies with personal circumstances.
1. Non-taxable amount
Pay items excluded from tax and insurance, such as a meal allowance. Since 2024 the meal-allowance exemption is 200,000 won a month. A larger non-taxable amount shrinks the taxable base and raises take-home pay, so the same gross salary can net differently depending on its non-taxable makeup.
2. Dependents and children
The simplified tax table adjusts monthly withholding by the number of qualifying dependents. The more dependents (including yourself) and children under 20, the lower the income tax.
3. Withholding rate (80 / 100 / 120%)
The most misread item. You can choose to withhold monthly income tax at 80%, 100%, or 120% of the table amount.
- 80%: less withheld monthly, so higher monthly net pay, but you may owe more at year-end settlement.
- 120%: more withheld monthly, with a better chance of a refund.
The key point: the total annual tax is the same either way. It's only a choice of receiving more each month or more at settlement.
Treat an estimate as an estimate
This kind of calculation is an estimate that approximates current rates and the simplified tax table. It doesn't account for company-specific non-taxable items, bonuses, mid-year joining or leaving, or your final year-end settlement, so it can differ from your actual payslip. For an exact figure, check Hometax or your payroll department.
It's still useful because, when comparing offers or setting a negotiation target, you can grasp roughly what a given salary means per month in seconds. Try several figures to sketch your negotiation range: drop a gross annual or monthly amount into the Salary Net Pay Calculator and it returns the estimated take-home pay after insurance and taxes, with an itemized breakdown.